DOI: 10.1002/jgrd.50454
论文题名: An assessment of cirrus heights from MISR oblique stereo using ground-based radar and lidar at the Tropical Western Pacific ARM sites
作者: Prasad A.A. ; Davies R.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 11 起始页码: 5588
结束页码: 5599
语种: 英语
英文关键词: MISR
; stereo heights
; thin cirrus
Scopus关键词: Clouds
; Radar measurement
; Tropics
; Atmospheric radiation measurement programs
; MISR
; Multiangle imaging spectroradiometer
; stereo heights
; Thin cirrus
; Tropical tropopause layers
; Tropical Western Pacific
; U.S. Department of Energy
; Optical radar
; cirrus
; cloud cover
; height determination
; histogram
; lidar
; marine atmosphere
; MISR
; radar
; stereo image
; tropopause
; Pacific Ocean
; Pacific Ocean (West)
英文摘要: We compare cirrus presence and heights (CTHs) using oblique stereo by the Multiangle Imaging SpectroRadiometer (MISR) with measurements from ground-based cloud radar and lidar sensors at the Tropical Western Pacific (TWP) sites operated by the U.S. Department of Energy Atmospheric Radiation Measurement Program. Precise point-wise comparisons, limited to only 195 coincident cases, showed that the total number of cirrus retrieved using oblique-stereo analysis improved to 70% from 39% using the standard-stereo technique. The stereo technique detects cloud with the highest contrast, which is often at lower altitude. The oblique-stereo technique's efficiency depends on the thickness and number of underlying cloud layers. A histogram approach allowed similar regions to be compared statistically with many more samples and showed three distinct peaks at ≈13 km, 15 km, and 19 km related to deep convective clouds, tropical tropopause layer (TTL) cirrus, and overshooting convective clouds, respectively. Most differences between the satellite and ground-based measurements resulted from a number of cases of invalid cloud comparisons (14%), blunders from edges and broken clouds (7%), low contrast stereo mismatches (4%), and under-estimation of CTHs (3%). Overall, the oblique-stereo analysis detected a cirrus-top layer in 65% of all the valid coincident cases, mostly <1 km in thickness. The oblique-stereo derived cirrus CTHs differed from the heights of cirrus-top layers from ground-based cloud radar and lidar by -0.5 ± 1.0 km, validating the MISR retrievals. This suggests global thin cirrus retrievals are possible with the oblique-stereo technique after the screening of occasional blunders. © 2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63693
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Physics, University of Auckland, 38 Princes Street, Auckland 1142, New Zealand
Recommended Citation:
Prasad A.A.,Davies R.. An assessment of cirrus heights from MISR oblique stereo using ground-based radar and lidar at the Tropical Western Pacific ARM sites[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(11)